-
Robert Hooke took a look at a of cork underneath a microscope and noticed that, up close, it looked like it was made of empty “cells” like the ones monks slept in at monasteries (or prisoners in jail)
-
Brothers Hans and Zacharias Jenssen developed the first compound microscope.
-
Schleiden, a botanist, studied hundreds of plants under his microscope and, in 1838, realized that each and every one was made of the cells.
-
In 1855, Rudolf Virchow published a book stating his belief that all cells are made from other living cells.
-
In 1839, Theodor Schwann realized that the nucleus of Schleiden’s plant cells was very similar to what he noticed in animal cells under his microscope.
